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US 6,208,701 B1Granted
Synchronizing apparatus
AssigneeMatsushita Electrical Industrial Co., Ltd.
InventorsKatsuhiko Hiramatsu, Mitsuru Uesugi, Hiroaki Sudo
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AssigneeMatsushita Electrical Industrial Co., Ltd.
InventorsKatsuhiko Hiramatsu, Mitsuru Uesugi, Hiroaki Sudo
Estimating the term…
The synchronizing apparatus includes a block for detecting a code from an input signal, a block for detecting from the code the variable points of the code at several times as high as the symbol rate, a block for calculating a histogram of the detected variables of the code to time, and a block for deciding that the phase number at which the calculated histogram takes the maximum value is a symbol synchronization point. This synchronizing apparatus detects the zero-cross points of an intermediate frequency band signal at N times as high as the symbol rate. It also calculates a histogram of detected time (0 to N−1). The time (0 to N−1) at which the histogram is the maximum within a predetermined detected time is selected as a symbol clock, and thereby symbol synchronization is established.
A synchronizing apparatus including means for calculating the sum of the absolute values of an in-phase signal and a quadrature signal after analog-to-digital conversion, and means, responsive to the sum of the absolute values, for acquiring synchronization by comparing a plurality of integrated values obtained at different sampling timing rates.
A synchronizing apparatus including means for integrating an in-phase signal or a quadrature signal after analog-to-digital conversion, and means for acquiring synchronization by comparing the absolute values of said integrated values of said data sampled at different sampling timing rates.
A synchronizing apparatus including means for integrating both an in-phase signal and a quadrature signal after analog-to-digital conversion, means for adding the integrated values of said in-phase signal and quadrature signal, and means for acquiring synchronization by comparing the absolute values of said added values of said data sampled at different sampling timing rates.
A synchronizing apparatus including means for calculating the absolute value of an in-phase signal or a quadrature signal after analog-to-digital conversion, means for comparing said absolute values of said data sampled at different sampling timing rates, means for calculating the integrated value of said compared values, and means for acquiring synchronization by use of said integrated value.
A synchronizing apparatus including means for calculating the sum of the absolute values of an in-phase signal a quadrature signal after analog-to-digital conversion, means for comparing said absolute values of data sampled at different sampling timing rates, means for calculating the integrated value of least one of said compared values, and means for acquiring synchronization by use of said integrated value.
A synchronizing apparatus, including:
A synchronizing apparatus, including:
A synchronizing apparatus having an envelope generator for generating an envelope signal by use of absolute values of an in-phase signal and a quadrature signal after analog-to-digital conversion, said envelope generator generating said envelope by adding a large-amplitude one of a pair of signals which indicate the absolute values of said in-phase and quadrature signals to a signal generated by multiplying a smaller-amplitude one of the pair of signals by 0.375, whereby synchronization can be acquired by use of the envelope signal.
Dependencies are inferred from the claim text.